Refrigerating apparatus



l J. ,ZANDIUL REFRIGERATING APPARATUS. APPLICATIN FILED MAY I?, ISIS*Patented May @9 M225;

4 SHEETS-'SHEET n.

I I Il A I I l @001.1% u vw J. ZANDER.

REFRIGEHATING APPARATUS.

APPLICATION m2o MAYH. 191s.

ma 595% mme@ may 9, @9;

J. ZANDERl REFRIGERATING APPARATUS. APPLICATIQN FILEDf MAY 17. 1191s.

` Emmar may 9, @922.

4 SHEETS-SHEET 4.

,ber for gasifying, by

AuNrrEn JOHN zAIvIiIzIwor cIIIcAGO, ILLINOIS.

BEFRIGERATING AIPAMTUS.

` lApplication iled May 17,

Aof which the following is a specicatlon.

My invention relates, more particularly,

to improvements in refrigerating apparatus ofthe type employing agenerating chamheat applied thereto, a suitable refrigeratlngagent,1such `as ammoniain solution, and a condensingcham-'7`f vided.

,ber into which the ammonia-gas produced-'ini' the generator-i,sdischarged and reduced tof a liquid condition, preparatory to itsintroduction 'into the refrigerating coils, and

. from which latter it passes inr` aseous condition back into thesolution'in t e generating chamber to -replenish the ammonia-contentthereof. l L

My rimary object is to provide for the simpli cation of apparatus ofthis general v charact r, to reduce the cost of construction th reofandthe cost of operation; to l rovide for the automatic control of thelieatingv means for the, generator andthe cooling medium .for thecondenser and the generator;A and generally "to providgefl-lim.povements apparatus of, this character whereby they will loe4betteradapted to perl form the functions for whichjtheyvare 'pro-'1'Referring tothe laccompanying drawmszflrkigg;` 1 is a view in elevation,partly 'dia-y grammatic, ofan apparatus constructed 1n accordance withvmyinvention; Fig. 2 1s a view` inlongitudinal verticaljsectionalelevation o ffvalve mechanism for controlling the supply of coolingmedium to the generating'an'd condensing chambers and the supply of theheating mediumto the generator,the section being taken at the lme 2 onFig.l 3v and viewed in the direction of the arrow,- Fig. 3 is a sectiontaken at the line 3 on Fig. 2 and viewed in the direction of the arrow;Fig. 4 is an, enlarged section taken at the line 4 on Fig. 2 `and viewedin the di` .'rection of the arrow, the valve :proper of theconstructionbeing shown in the position it assumes when shifted fro'mthe position shown inl Fig. 2 to the other position a's-A sumed loyv itin 'the operation of the appara- Specification of Letters Patent. yPatented May-9, `1922.

191e. serial No. 98,038.

tus; Figo is a plan view of the valve proper 0f Figs. 2, 3 and 4; Fig. 6is a vieyv 'in" vertical elevation of a desirable form` 'of valve forcontrolling the supplyof heating medium to the generator; and Fig. 7,`Ka

similar view of One of the number` of shutoff valves employed in thelinesfor the refrigerating agent. The generating-chamber is representedat 8, this chamber, in theparticular construction illustrated, beingprovided to receive the solution containing., thee,- A#refr-igerating'agent, such asl animonia,'which is subjected tothqinecessary heat forgasifying the am# moniacontent thereof and driving it off under thedesiredL pressure by an suitable means. The means shown for this purposeis gas, which is vsupplied tov a burner. 9 loe cated. below an Opening10 in a casing 11 partlally enclosing the chamber 8, through lavalve-controlled pipe leading from a suita-v lele,l source of gassupply, as hereinafter ,explained.,` A pipe 12 leadS'frOmfthefupper endof the chamber 8L and connects with the upper end of accil 13 located ina tank y1,4,- the othery end,.of- Ithis. coil opening-into a chamber,15- located in" the'l bottom of this tank, the pipe1f2-havingin'terposed therein v.a check-"valvelof'any desirableconstruction, which "permits ofthe passage vof the ammonia gas from thechamberlS into the coil y13', but reventsa reverse flow. 4. ,TheV'chamber 15 1s provided for receiving the" ammonia after ity iscondensed in the 'coil 13 and furnishes the supply of liquid relfrigerant, whichy flows, therefrom `through a pipe 13a to theeXpansion-yalve, which maybe of anyr "suitable constructionl and visrepresented at 16, this valve opening into the refrigeratin -coil 17.`The pipe 13*1 extends down'war ly 'at one end through the tank 14 andthe top of the chamber 15 into lthe latter to a point close to thebottom thereof, as represented. The other endof the refrigerating-coil17 is connected by a ipe 19 with a spray-ringy 20 located in the owerportion vof the generating-chamber .8, for conducting the spent ammoniagas,

after performing its refrigerating function, into the solution in'thechamber 8 for replenishing the supply of ammonia content thereof, thepipe 19 containin a `checkvalve, represented at 21, and which may be ofany suitableconstruction, operating t0 permit theV fiowiof gas throughthe pipe 19 into the chamber 8, but preventing reverse flow.

" `Means are provided for maintaining the circulation of a` coolingmedium inthe tank 14 during the operation of the generator, to. properlycondense the ammonia gases discharged into the coil 13 -to supply acool,-

. Aing medium' to the coil 22 provided inthe generatingchamber 8 duringthe periods when the `generator is not operating as a generator ,andtocontrol the operation of .theburn'er for the generator. l

In accordance with the preferred illustrated embodiment of my invention,which employs water as the cooling medium and gas asfthe heating mediumfor the generator, provision is made for automatically shutting olfy thesupply of gas to the biirner 9 when the ammonia content of the solwtionV inthe generator 8 becomes so reduced by .the generating. action,thatit is notcommercially feasible to continue to generate y gas from.this solution until the ammonia ter through the coil 22 of thegenerator, and

automatically starting the burner 9.into koperation to recharge thechamber `15 with -liquefiedf ammonia, ya -descript-ion'iof the meansprovidedforthis purpose being as follows v g v In carrying out thiscycle of operations,

`I preferably provide the yvalve mechanism shown in Fig. 2,rk this valvecomprising a casing 23 having a centrally-disposed chamber 24 containinga 'longitudinally-shiftable valve 25, and y,chambers 26 and 27 lo: catedat'opposite'ends'of the chamber 24. The chamber 24 contains 'an opening28 in its side Wall. which communicates with the interior of a housing29 which connects with a pipe 30 which would lead fromv any suitablesource of relatively cold water supply, as, for example, the ordinaryservice main,

and through which the water is supplied to the cooling means for thecondensing part of the apparatus and the generator alternately, througha pipe 31 which connects at one end with the lower end of the tank 14and at its opposite end with aport 32 in a side wall of the chamber 24,and through'a pipe 33 which connects at one end with the upper end ofthe coil 22 and at its opposite end with a port, 34 lbcated in a sidewall of the chamber 24,'the upper end of the tank 14' being connected toa drain-pipe 35` which may lead to a sewer andthe lower end .of theycoil 22 being connected with this drain pipe through a pipe 36.' l l,

The valve 25 contains in its periphery and intermediate its ends anannular recess 37, the bottom of which is annularlyrestricted,

`as indicated at 38, to provide annular shoulders 39 on whichga circularband 40 of screening material," as for example, lvery fine mesh, isseated to prevent solid matter from entering the.` chamber 24a-tepposite ends of the valve. The parts ofthe valve structure are soconstructed and arranged, vas shown, that when the valve 25 is invoneposition (the position shown in Fig. 2) water can flow from the pipe 3()into the Yhousing 29, thence through the port 28, to

`.the groove 37, and out through the pipe 31 to the tank 14; andwhen'the valve is shifted y to theright in Fig. 2 to the position shownin Fig. 4, from the groove 37 into and through the port 34 and pipe 33to maintain a flow of cold water through the coil 22, the arrangementbeing such that when the water supply is open to the pipe 31, it isclosed to the pipe 33, and vice Versa.

The end walls of the chamber 24 contain passages 41 and 42 whichcommunicate with ypassages 43 and 44 provided in plugs 45 and 46confined in openings in the said end walls, Vthe inner endsof thepassages 43 and 44 openingI into the chamber 24 at opposite sides of thevalve 25, respectively. The passage 43 is controlled by a valv'e47mount-l ed on a rod 48 slidable in the plug 45 and having a head 49between which and a teni sion-ruht 5l) surrounding and ksecured to the"plug`4o, acoiled spring 51 is interposed, this spring tending to closethe valve 4T.Y The chamber 26 contains a flexible diaphragm 'againstwhich the head 49 bears when the valve 4i' is closed.'` this diaphragmbeing spaced a slight distance from the `adjacent end wall ofthe chamber26 to provide a space 53 intoy which a pipe 54 opens at one kend,'theopposite end of this pipe communi.

rating with the interior of a tube closed at its upper and lower endsand preferably containing water or any other suitable liquid` whichgasifies vat a higher temperature than that at which the refrigeratingagent employed, gasies, which rises to a point short of the connectionof the pipes 54 and 55 witlaeach other, the pipe extending downwardlyinto the generating-chamber'3. preferably to a point close to the bottomof 'the latter, for a purpose hereinafter ex plained.` Communicationbetween the passage 44 and the chamber 24 is controlled by means of avalve 56, of the needle type, the point of the valve co-operating with avalve'- seat formed on the inner end of a plug 5'? lll) screwed into theend of the passage 44v and containing an opening therethroughformopening into the chamber 15 throughthe topv of the latter.

The valve 25 contains passages 64 and 65 which communicate with, andlead in opposite directions from, the groove 37,*the outer' ends ofthese passages communicating with tle interior of the chamber 24 atopposite sides, respectively, ofthe valve 25, these pas vsages beingrelatively small asfcompared with the passages that communicate withJthe opposite endsof the chamber 24 and-'are `controlled by .ther-valves47 and 56,)respeotively.

The control of the supply of gas toth'e burner 9 through the pipe-66connected therewith, and which in practice wouldbeconnected with anysuitable source of gas supply, is effected through the water supplycontrolled by the valve 25, and to this end thegas-controlling valverepresented at 67, and interposed in the pipe-66, is connected withihepipe `31 by a pipe 68, to so operate the valve 67 that gas is suppliedto the .burner9 during that part of the cycle of opv.erlationof theapparatus injwhich the cooling waterissupplied to the tank 14 and thesup-- ply thereto to the burnerV is shut olf during that part of thecycle 'in whichcooling water is supplied to the coil 22,`the burner 9being',

provided with a pilot connected witha pipe 69 whichXconnects with thevgas supply pipe;`

' 66 in advance 'of the4 valve 67 in 'order that theburner maybeinstantly klighted 'autoematically upon opening they valve 67'. A

suitable `form of the valve 67 is shown in Fig. 6, this valve,`generallystated, comprising a valve-casing 70 containing a chamber 71,'into whichthe pipe A68\opens beneath' a flexible ydiaphragm 72 in Vsaid chamber,this chamber being in communication with the' pipe 66, above thediaphragm 72 through the passages 73 and 74, respectively; and areciprocable valve mounted in the passage 74 for controlling the ow ofgas through the passage 78 and lthence to the burner. The valve 75(zo-operates at its section 7 6 "with ythe seat 77 to close the valvewhich isl backed up by la coillspring 78 tending. to move it to closedposition, and co-operatmg with the valve is a slidable member 7 9` whichlengages at its upperfendthe under-.surface of the valve and engages. atitslower end the diaphragm72. y. ,v

The operation of the apparatusis'as follows: Assuming that thegenerating-*chamber 8 ischarged up to about the level indicated at Xwith an ammonia solution of about 30 percent strength, as is commonlyused, and that the valve-mechanism of `Fig.

2 is. in the position therein represented, water from the supply willpass through the pipe 30, valve-mechanism of Fig 2, pipe 31, and thencethrough the' tank 14 from which it overflows throughthe pipe 35 to thedischarge, andwill also ill the pipe 68 under pressure sufficient tounseat the valve ,76, permitting gas to flow to the burnerk 9,

where it burns, heating the liquor in the chamber 8.l The subjection ofthe solution,-

as stated, to heat, gasies the ammonia therein, which passes trom thischamber throughithe pipe 12 and into the rcoil'l,

wherein it is subjected lto the cooling action of the water entering thetank 14`froin' the pipe 31, andl discharges into the chamber 15inliqliid condition. The generator continues to operate ".to gasify theammonia-content 'ot' the solution therein, until the ammoniacontentbecomes reduced to a predetermined degree,y whereupon the pressuregenerated by 'the vapor in the closed pipe 55, acting against thediaphragml 52 of the valve mechanism, yin oppositionl tov the action` ofright-.hand end of. ,the piston-valve 25 in Fig. 2 to become reduced ascompared with the pressure against it at its opposite end, and thus-thisvalige wshifts tothe right in is movedQoiit-"of registration `with thepipe 31"an'dintogregistration with thepipe 33,

the waterdisplacedin this operation dis. chargingthrough; the passages43 and 41,

and pipe 80l which communicates -with apipe 81 discharging. preferablyinto the tank 14.

fthe" spring 51, unseats the valve 47whi ch\ Y causes the water-pressureexerted againstthe Fig. 2 to itsextreme position, inwhich it jTlre""`ac`tuationofl the valve 25, as stated, ar-

rests theflow ofy cooling medium to the tank 1 4 through the pipe 61 andreduces the pressure in th/e pipe 681 to 'such a degree that the valve75 automatically closes under the ac- `tionl"ofits spring \78, whichshuts off the supply of gas to the burner 9. At the same time, the valveupon moving to the position stated opensthel pipe 33 to the watersupply. with which this valve mechanism is connected, whereupon the coil22 is-supplied with the desired cooling medium, which serves to cool theammonia solution in the generator .8 upon extinguishing the burner 9 toreduce the pressure injthe generator and toyabsorbfthe heat prduced bythe intermixing of the ammonia gas, flowing from theretrigerat/ingcoil'17with .thepsolution 2 in the generator 8 during therefrigeratingploperationhereinafter referred to.

iso

y The liquid refrigerant passes from the chamber 15' through the pipe13a and eX- pansioh-valve 16 intothe ref rig'erating-coil i 17, underthe pressure'in the chamber 15, to perform rthe refrigerating functionin" this coil., the ammnia gas passingfromthe latternthrougli the -pipe19 to the spray-ring 2() fromfjwhich it discharges intof the ammoniasolution inthe fch'amber 8 to replenish they ammonia content thereof,the cooling of the contents of theJ chamber 8,` as stated, malntainingthefiovv of ammonia gas intothe solution in the, tank 8 forintermiirture there- When the supply of liquid refrigerant in thechamber ,15 becomes so reduced' that thev ragainstthe diaphragm 61through the pipe 63 and in opposition to the spring 60, and

which pressure is suiiicient to maintain theY valve 56 in closedcondition during thel operation oflthe generator, becomes reduced tosuch a degree that the, spring 60 opens the Vvalve 56, permittingtheWater in the cham` ber 24 at the left-hand side of the valve 25 in Fig.2,' 'to readily escape therefrom through the passages 44 andr42 and apipe v82 which discharges, into the pipe 8,1, the valve 47 .havingpreviously automatically closed by the reduction Vof pressure, in thepipe upon extinguishing 'the burner 9 thus reducing the pressure at thisside Vof the valve 25 which causes it Vto slide to the positionrepresented in F ig; 2, in which the pipe 33 is cut oit from the'watersupply and the pipe 31 is o ened thereto,thus causing e the circulationo cooling Water through the coil22 tofceaseyfestoring the circulatlon oftheco'oling Watnthrough the tankV 14, and, [by reason ,of the' pressurein the 'pipe 68, opening the valve 167 /to supply as to the burner; 9,Where it is 'automaticall yl-ignlted by the pilot, and the operationsherelnbefore referred to are,-repeated until the 'supply 4 ofliquidrefriger'nt v,in the chamberf.15 y1s replenished, 'whereupon theother described operations are resumed, these operations 'alternatingunder the automaticcontrol of the described apparatus provided for thispurose. Y c p It is desirable, as, for example, when repairs areV to bemade, that provision be made for shutting off certain portions ofthelines through which the refrigerating agent Hows, and to this end thevarious pipes traversed by the refrigerating agent are equipped withvalves Which are preferably locatedin the pipes 12, 18,19 and 6 3, andare represented at 83.` These valves may be of any suitable form butpreferably are of the form shown in Fig. 7, each comprising a casing 84containinga chamber 85 communicatin with the inlet and outlet of thecasing. T e -casing contains a needle valve 86 Whichco-` Voperates witha seat .87, and is equipped with ra removable cap I88 which covers thatportion of the valve 86 which is provided'for co-l operation 1With aWrench or `other tool for adjustingthe valve.

whereby thevalve may be shifted by hand,

.if desired. Y

To avoid theescape of ammonia fumes into the room in Which the apparatusis located, should the diaphragm 61 become impaired or the pressure inthe chamber 8 become sufficiently great to open the reliefvalve 92 forthis chamber, I connect the interuior of the chamber 27 with the pipe81, by 'a pipe 93, and the discharge of reliefvalve 92, with a pipe 94`which opens into pipe 81, thus leading the fumes intothe Water vin thetank 14 wherein they become absorbed.

It will be noted from the foregoing that by providing for the actuationof the uidpressure-operated valve, in one direction, by the pressure ofVapor generated by the heat of the generating means, the operation ofthe apparatus is rendered dependable inasmuch as the'pressure exerted bysaturated vapor at any given temperature is fixed and is not depedableupon anyI given quantity of li ui he provisionofthe shell 11'surroundingI y ber is desirable, inasmuch as it serves to -edect thedesired heating of the solution in the tank SQby operatingy the burner 9'and leaves the upperend of the chamber 8, through Which thegasiedrefrigerating agent passes in its passage to the'coil`13,

' exposed vto the cooling effect of the surrounding atmosphere, thusacting as a rectifier or'v deh'ydra-ter to precipitate Water-vapors inthegas.

While I have illustrated and described a particular embodiment of myinvention, I do not Wish to be understood as intending to limit itthereto, as the same may be variously modified and altered withoutdepartin from the spirit of my invention.

Vhat I claim as new and desire to secure by Letters Patent is -1. Inrefrigerating apparatus, the combination of generating meansiforgasifying a refrigerating agent in solution, condensing means for thegasified refrigerating agent in communication with said generatingmeans, a refrigerating coil in communication with said generating meansand said condensing means, means for supplying heat to said generatingmeans, and meansl operated by fluid-pressure, operating automatically,to control said last-named `means to discontinue the supplying of heatto said generating means when the solution containing the re-`rigerating agent becomes weakened toa pre` determineddegree.

2. In refrigerating apparatus, the combination of generating means ,forgasifying a refrigerating agent in solution, condensing means for'thegasified refrigerating agent in communication with said generatingmeans, a refrigerating coil in communication with said generating meansand said condensing means, means for supplying-heat to said generatingmeans, means orsupplying a cooling medium to said condensing means, andmeans operated by fluid-pressure, operating automatically, to controlsaid means for supplying heat tosaid generating means and said means forsupplying a cooling medium to said condensing means, to discontinue thesupplying of heat' to said generating means, and the cooling medium tosaid condensin means.

3. In refrigerating apparatus, thecombination of generating means for.gasif'ying a refrigerat'ing agent in solution, condensing means for thegasified refrigerating agent in communication withd said kgeneratingmeans, a refrigerating coil in communication `with said generating meansand said condensing means, means for supplying heat to said generatingmeans, means for supplying a cooling mediumto said condensing means,

.and means operated by fluid-pressure, op-

erating automatically, to control said means for supplying heat to saidgeneratng'means` and said means for supplying a cooling medium to saidcondensing means, to discontinue the supplying of heat to said generatiing means and the cooling medium to said condensing means When thesolution containing the refrigerating agent becomes Weakened to apredetermined degree.

4. In a refrigerating apparatus, the combination 'of generating meansfor gasifying a iefrigerating agent in solution, condensing means forthe gasiiied rerigerating agent in communication with said generatingmeans, a refrigerating coil in communica-l tion with said generatingmeans and said condensing means, means for supplying heat to saidgenerating means, means for supplying a cooling medium to saidcondensing means, means for supplying a cooling me- .diuni lto saidgenerating means, means operated by fluid-pressure,operatingautomatically, to control said'ineans for supplying heat to saidgenerating means and saidneans for supplying a cooling medium to saidcondensing means, to discontinue the supplying of lieat to saidgenerating means and the coolino'medium to said condensing means, and{itiJid-pressure-operated means, operatingautomatically, to discontinuethe supplying of *cooling medium to said generating means. A

5. In refrigerating apparatus, the combination of generating means forgasifying a refrigerating agent in solution, condensing means forthegasied refrigerating agent in communication with said' generatingmeans, a refrigerating coil in communication with said generating meansand said condensing means, means for supplying heat 'to said generating"means, means for supplying a cooling medium to said condensing means,means for supplying a cooling medium to said generating means, and meansoperated'by Huid-pressure, operating automatically, to discontinue tliesupplying of cooling medium toi said condensing means and the supplyingof heat to said generating means and to supply a cooling medium to saidgenerating means, when the solution .containing the refrigerating agentbecomes weakened to a predetermined degree, and to discontinue thesupplying of cooling medium to said generating means and .to supplycooling medium to said condensing means and heat to said generatinchamber when the supply of liquefied retrigerating agentlbecomes'reduced to a predetermined extent.

6. In refrigerating apparatus, the combination of generating means forgasifying a refrigerating agent in solution, condensing means for thegasified refrigerating agent in communication with said generatingmeans, a refrigerating coil in communication with y'said generatingmeans and said condensing means, means for supplying heat to saidgenerating means, a conduit adapted to convey a cooling medium underpressure to said condensing means, and Valve-mechanism operated by saidcooling medium, operating automatically, to discontinue the supplyingot' lieat to said generating means and cooling medium to said condensingmeans when the solution containing the i'efrigerating agent contro lingmeans for said heat-supplying meansoperated by fluid pressurefromsaidsupply, valve mechanism controlling the flow of fluid to said last-namedmeans, and means, controllable by the pressure of vapor generated insaid container, for controlling the operation of said valve mechanism. i

l8. ln refrigerating apparatus, the combination of generating means forgasitying `a l refrigerating agent in solution, condensing means fornthe gasilied refrigerating agent in communication with 'said generatingmeans, means for supplying heat to said generating means, a containerfor a luid positioned to be subjected to the heat supplied to thegenerating means, means for supplying a cooling medium to saidcondensing means, and means, controllable by the pressure. generated insaid container, for controlling the operation of said means forsupplying heat to said generatin means and a cooling medium to said conensing means.

9. In iei'rigeiatingapparatus, the combination of generating means forgasifying a refrigerating agent in solution, condensing means for thegasiiied refrigeiating agent in communication with said generatingmeans, means for supplying heat to said generating means, a containerfor a fluid positioned to be subjected to the heatsupplied to thegenerating means, means for supplying a cooling medium to saidcondensing means, and luid-pressure-operated means, controllable by thepressure generated in said container, for controlling the operation ofsaid means for supplying heat tosaid generating means, and a coolingmedium to said condensing means.

l0. In refrigerating apparatus, the combination of generating means forgasifying a refrigerating agent in solution, condensing -means for thegasiiied refrigerating agent in communication with said generatingmeans, means for supplying heat to said generating means,iiuid-pressure-operated valve mechanism, means controlled by said valvemechanism yfor controlling said means for supplying heat to saidgenerating means, and means, operating automatically, when the solutioncontaining the iefrigeratingv agent becomes weakened to a predetermineddegree, to operate said mechanism and .to'discontinue the supply of heatto said generating means, and When the supply of liquefied refrigeratingagent becomes reduced to a predetermined extent to operate said valve toa position in Which heat is sup/plied to Said generating means.

11. In refrigerating apparatus, the combination of generating means forgasifying a refrigerating agent in solution, condensing means for thegasied refrigerating agent in communication with said generating means,a refrigerating coil in communication -With said generating means andsaid condensing means, means for supplying heat to said generatingmeans, means for supplying a cooling medium to said condensing means,means for supplying a cooling medium to said generating means, valvemechanism operating when in one position to supply` gas to saidgenerating means and cooling medium to said condensing means and arrestthe How of cooling medium to said generat- Laisse-iing means, and whenin another position te cause the supplying of heat to said generatingmeans and. cooling medium to said condensing means to be discontinuedand supply cooling medium to said generating means, means controlled bya change in condition in said generating means, for controlling themovement of said Valve in one direction, and means controlled by achange of condition in said condensing means for controlling themovement of they valve in the opposite direction. l

l2. In refrigerating apparatus, the combination of generating meanslor'gasifying a rerigerating agent in solution, condensing means for thegasied refrigerating agent in communication with said generating means,a refrigerating coil in communication with said generating means andsaid condensing means, means for supplying heat to said generatingmeans, means for supplying a cooling medium to said condensing means,means for supplying a cooling lmedium to said generating means, valvemechanism operating when in one position to supply gas to saidgenerating` means and cooling medium to said condensing means and arrestthe flow of cooling medium to said generating means, and when in anotherposition to cause the supplying of heat to said generating means andcooling medium to said condensing means to be discontinued and supplycooling medium to said generating means, fluid-pressure-operated meansoperating by pressui-egenerated by the heat ofsaid eueiating means, formoving said valve in\one direction, .and means controlled by a changeoi' condition in said condensing means for controlling the movement ofthe valve in the opposite cirection.

13. In refrigerating apparatus, the combination of generating means forgasifying a refrigerating agent in solution` condensing Ameans for thegasified refrigerating agent in communication with said generatingmeans, a refrigeiating coil in communication. with said generating meansand said condensing means, means for supplying h eat to said generatingmeans` means for supplyling acooling medium to said condensing means.means for supplying a cooling medium to said generating means, valvemechanism operating when in one position to supply gas to saidgenerating means and cooling medium to said condensing means and arrestthe flow of cooling medium to said generating means, and when in anotherposition to cause the supplying of heat to said generating means andcooling medium to said condensing means to be discontinued and supplycooling medium to said generating means, said valve mechanism includinga chamber, and a valve movable in said chamber, with passagescommunicating with said chamber at opposite ends thereof and openinginto the supply of fluid pressure,l means for relieving Saidvalve-chamber at one end of said piston of the pressure therein,controllable by a change of condition in said generating means, andmeans for relieving said valve-chamber at its opposite end 'of thepress-ure therein contained controllable by a change of condition. insaid .condenslng means. i

14. In refrigerating apparatus, the conibination of generating means forgasifying a refrigerating agent in solution, condensing means for theasified refrigerating agent in communicatlon with said generating means,a refrigerat-ing lcoil in communication with said generating means andsaid condensing means, a valve-casing containing a chamber having aIport adapted to communicate with a source of fluid pressure, and otherports, a valve in said chamber and shiftable therein, said valvecontaining passages whereby fluidpressurel from said source enters saidVvchamber into its opposite ends, said valve operating to `alternatelyopen said other ports in said valve-casing,

means communicating with one of said other ports for conveying a coolingmedium to said condensing means, means controlled by the pressureflowing through said last-referred-to port for supplying a heatingmedium to said generating means, means connected withthecother of saidother portsI for conducting a. cooling medium to said generating means,valve equipped lports at the opposite ends of said chamber for vent-.ing the ends of this chamber alternately, [means controlled by achang-e of conditions in said generating means for controlling 'thevalve means for one end of said chamber, 40 and means controlled by achange of conditions in the condensing means for controlling the valveat the opposite end of said chamber.

15. In refrigerating apparatus, the combination ol generating means forgasifying a refrigerating agent in solution, condensing means'or the gaified refrigerating agent in communication with said generating means, arefrigerating coil in communication with said generating means and saidcondensing means, a valve-casing containing chamber having a portadapted to communicate with a source oi'l Huid pressure, and otherports, a valve in said chamber and shittable therein, said valvecontaining pas- \,sagcs whereby fluid pressure from said source enterssaid chamber into its opposite` ends, said valve operating toAalternately opeu said other ports in said valve-casing,

means communicating with one of saidother ports for conveying acoolingvmedium to said condensing means, means controlled by thepressure flowing through said Vlast-.referred-to port for supplying aheating medium to said generating means, means communicating with theother of said other ports for conducting .a cooling medium to saidgenerating means, said chamber c011- taining relatively large' passages,opening into its Opposite ends, ai valve tending normally to seat,controlling one of said passages, a valve tending normally to becomeunseated, controlling the'other of said passages, means operated byyachange of conditions in said generating means for opening one of saidvalves which tends to seat, and means controlled by a changerofconditions in said condensing means for holding to its seat the one ofthe valves Which tends to unseat.

16. In refrigerating apparatus, the combination of generating means forgasifying a refrigerating agent in solution, condensing means for 'thegasifiedv rerigerating agent in communication with said generatingmeans, means for supplying heat 'to said generatingmeans, afluid-pressure-operated valve, means controlled by said valve forvcontrolling the supply of heat to said generating means, and means forcontrolling the position of said valve responsive to the increase. intheheat of the said solution in the operation of gasifying therefrigerating agent contained in the solution.

17. In refrigerating apparatus, the combination of generating-means forgasifying a refrigerating agent in solution, condensing means for thegasified refrigerating agent in communication with -said generatingmeans, means for supplying heat to said ygenerating means, afluid-pressure-operated in Vone position to cause said heat-supplyingmeans to supply heat to said generating means and when said valve is inanother position to discontinue the supplying of heat to said generatingmeans, vent passages in said valve-chamber at opposite ends of saidvalve and of greater cross-sectional area than the passage in saidvalve, valves controlling the passages in said valve-chamber, and meanssubjected to the heat applied to said generating means for controllingonel ot' said last-named valves to cause one end ot' said valve-chamberto become vented and permit said first-named valve to be moved by saidfluid pressure to a position in which the su pplV of heat. to saidgenerating means is discontinued when the solution contain- ,ing therefrigerating agentbecomes-Weakened to a. predetermined degree, andmeans controlling the other of` said last-named! I under pressure,

determined eXtent.

18. T he combination with a source of fluid chamber having a port in itsside Wall, a longitudinally-shiftable member in said chamber containinga passage open at all times to said supply of fluid-pressure and openingthrough opposite ends of said member, said chamber containing passagesat its opposite ends of relatively greater cross-section than thepassages in said member, and valves controlling the passages in the endsof said chamber.

19. The combination With a source vof fluid under pressure, of a casingcontaining a chamber having a port in its side Wall, alongitudinally-shiftable member in said chamber containinga passageopen` at all times to said supply of fluid pressure and opening throughopposite ends of said member, said chamber containing passages yat itsopposite ends of relatively greater crosssection than the passages insaid member, valves controlling the passages in the ends of' saidchamber, means tending to seat one of said last-named valves, meanstending to unseat the other of said last-named valves,

means for unseating the one of said valves'.

which tends to seat, and means for seating the other of said valveswhich tends to unseat. I

20. The combination with a source 'of fluidl under pressure, of a casingcontaining a chamber having a port in its side Wall, alongitudinally-shiftable member in said chamber containing a passageopen at all times to said supply of Huid pressure and opening throughopposite ends of said member, said chamber containing passages at itsopposite ends of relatively greater crosssection than the passage insaid member, valves controlling the passages in' the ends of saidchamber, means tending to seat one of said last-named Nalves, meanstending to unseat the other of said last-named valves, diaphragmsco-operating with saidl lastnamed valves for unseating .and seatingthem, respectively, and means for supplying pressure against saiddiaphragm. to actuate said last-named valves.

2l. The combination With a source of fluid under pressure, of a casingcontaining a chamber having a port in its side Wall., alongitudinally-shiltable` member in said chamber containing a passageopen at all times to said supply of fluid pressure and opening throughopposite ends of said member, said chamber containing passages at itsopposite f ends of relatively greater cross- ,of a casing containing a.

when said member is in one position Aitor disy charging through saidlast-named port the fluid 'pressure introduced into said member and tobe out of communication with said. port When said member is moved toanother position. n A i 22. In refrigerating apparatus', the combinationof generating means for gasifying a refrigerating agent in solution,condensing means for the gasiiied refrigerating agent in communicationWith said generating means, a refrigerating coil in communication withsaid generating means and said condensing means, means for conducting acooling medium to said condensing meansand heat to said generatingmeans, valve.. mechanism for controlling the supplying ot a coolingmedium to said condensing means and heat to said generating means, andaplurality of means operating alternately by variance in conditions insaid condensing means and said generating means to actuate said valvemechanism, for the purpose set forth.

23. in refrigerating apparatus, the combination of generating means forgasifying a yrefrigerating agent in solution, condensing means for thegasiied refrigerating agent in communication With said generating means,means for supplying heat to said generating means, means operated byfhidpressure `for controlling the operation o' said means for supplyingheat to said generating means, vapor-generating means subject to the.heat of said generating means and operating to control sai-dlast-named'means yby the vapor evolvedby the heat of said generatingmeans.

. 24. In refrige'rating apparatus, the com? bination of generating meansfor gasifying a refrigerating agent in solution, condensing means forthe ygasiied refrigerating agent in communication with said generatingmeans, means for supplying heat to said generating means, means forsupplying a cool-ing medium to said condensing means, means operated byfluid-pressiire for controlling the operation `of said means for'supplying heat to said generating means, and said means for supplying acooling medium to said condensing means, and vapor-generating meanssubject to the heat of said generating means and operating to controlsaid vduidpressure-operated means by the vapor evolved by the heat ofsaid generating means.v

2/5. In refrigerating apparatus, the combination of generating means forgasi'fving a refrigerating agent in solution., condensing means for thegasilied refrigerating agent in communication with said generatingmeans, means for supplying heat to said gene-rating means, means forsupplying a cooling medium to said condensing means, means for supplyinga cooling medium to said generating means, means operated byfluid-pressure for Controlling the operationA of said means forsupplying heat, said means for supplying a cooling medium to thecondensing means and said means Jfor supplying Water tosaid generatingmeans, vaporgenerating means subject to the heat of said generatingmeans and operating, by the vapor evolved by the heat of said generatingmeans to control the operation of said last-named means, fordiscontinuing the supply of heat to said generating means and a coolingmedium to said condensing means and supplying a cooling medium to saidgenerating means, When the refrigeratingagent content of said generatorbecomes reduced below a predetermined degree.

26. In refrigerating apparatus, the combination of generating means forgasifying a refrigerating agent in solution, condensing means for thegasiiied refrigerating agent in communication with said generatingmeans, means for supplying heat to said generating means, means operatedby fluid-- means for the gasied refrigerating agent in communicationwith said generating means, means for supplying heat to said generatingmeans, fluid-pressure-operated means for controlling the operation ofsaid heat-sup.

plying means, and means controllable by the pressure of vapor generatedby the heat of the contents of said generating means, forcontrolling-the operation of said lastnamed means.

28. In a refrigerating apparatus, the combination of generating meansfor gasifying a refrigerating agent 1n. solution, condensing means forthe asified refrigerating agent in communication with said generatingmeans, means for supplying heat to said generating means, Ameans forsupplying a cooling medium to said condensing means,fiuid-pressure-operated means for controlling saidheat-supplying meansand said means for supplying a cooling medium to said condensing means.and means controllable by the pressure of vapor generated by the heat ofthe contents of said generating means, for controlling the operation 'ofsaid last-named means.

29. In a refrigerating apparatus', the combination of generating meansfor gasifying a refrigerating agent in solution, condensing means forthe gasified refrigerating agent in communication With.: said generatingmeans, means for supplying li`e` a`t\to\saidnY pressure of the condensedrefrigerating f fluid, for controlling the flow of cooling medi-ums tosaid condensing means and generating means, and the supplying of heat tosaid generating means, to effect the discontinuing of the supply ofcooling medium to said condensing means and heat to said generatingmeans and the supplying of a cooling medium to said generating meanswhen the refrigerating agent content of said generating means becomesreduced to a predetermined degree, and to effect the discontinuing ofthe supply of cooling medium to said generating means and supply acooling medium to said condensing means and heat to said generatingmeans when the pressure of tliefluid-refrigerating agent becomes reducedto a predetermined degree.

30. In refrigerating apparatus, the conibination of generating means forgasifying a refrigerating agent in solution, condensing means for thegasied refrigerating agent in communication with said generating means,a refrigerating coil in communication with said generating means andsaid condensing means, means for supplying a codling a-gent 4to saidcondensing means, means for supplying heat to said generating meansoperated by the flow of cooling agent to said condens` ing means tosupply heat to said generating means during the flow of cooling agent tosaid condensing means, and automatically discontinue the supplying ofheat to said a generating means when the How of cooling agent becomesreduced below a predetermined degree, and means automatically connamedmeans tcpdiscontinue the supplying of heat to said generating means, asource of fluid-pressure, a conduit leading from said source offluid-pressure to said condensing means and to said last-named means,and valve mechanism controllable by-conditions in said generating meansfor controlling the flow of fluid-pressure through said conduit.

32. In refrigerating apparatus, the coinbination of generating means forgasifying'" a refrigeratingagent in solution, condensing means for thegasied refrigerating agent 1n communication with said generating means,a refrigerating coil in communication e miam means., f

JOHN ZANDER.

